Tetraethylenepentamine-Modified Siliceous Mesocellular Foam (MCF) for CO2 Capture

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• 作者：Xingxing Feng ; Gengshen Hu ; Xin Hu ; Guanqun Xie ; Yunlong Xie ; Jiqing Lu ; Mengfei Luo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 20, 2013
• 年：2013
• 卷：52
• 期：11
• 页码：4221-4228
• 全文大小：448K
• 年卷期：v.52,no.11(March 20, 2013)
• ISSN：1520-5045

文摘

Mesocellular silica foam (MCF) materials with different pore volumes were prepared and modified with tetraethylenepentamine (TEPA) as sorbents for CO₂ capture. The as-prepared sorbents were characterized by XRD, TEM, SEM, nitrogen adsorption/desorption, and FTIR. CO₂ capture performances of the adsorbents were tested in a fixed-bed reactor equipped with an online MS. The results indicated that the pore volume of supports has great effect on the CO₂ capture performance. With the increasing of pore volume as well as the window and cell sizes of the MCF, more TEPA can be loaded into the pores of MCF. For MCF with larger pore volume, more unoccupied space is left after the same amount of TEPA was loaded into the pores. The unoccupied space is beneficial for higher CO₂ uptake because the mass transfer limitation can be reduced to some extent and the interaction between CO₂ and TEPA may be easier. MCF material with largest pore volume exhibited the largest CO₂ uptake of 4.34 mmol/g of adsorbent with a 70 wt % TEPA loading tested by the fixed-bed reactor and at least 4.57 mmol/g tested by thermogravimetric analysis (TGA) under the conditions of 10.0% (v/v) CO₂ in N₂ at 75 掳C. Repeated adsorption/desorption cycles revealed that its high CO₂ capacity can be regenerated via temperature swing adsorption and so it may be useful for CO₂ capture via TEPA functionalized MCFs.